RE: Holding tank and water tank=which side for pump out and fill???
It's disturbing to think that you might be drawing fresh water into your holding tank. Do you by chance have a Levac toilet? I'm thinking that if you have a blocked vent in the holding tank, then as you pump out the tank you could be sucking raw water in through the toilet and into the holding tank. I can't think of any other toilet that might happen with.
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